springmvc rsa 前后台登录密码加密

1、所需js插件：点击打开链接

2、pom依赖：

<dependency>    <groupId>org.bouncycastle</groupId>    <artifactId>bcprov-jdk15on</artifactId>    <version>1.54</version></dependency>

3、controller两个接口，生成公钥（两个指数）和解密：

@RequestMapping(value = "/userLogin", method = RequestMethod.GET)@ResponseBodypublic Object login(HttpServletRequest request) throws Exception {JSONObject result = new JSONObject();KeyPair kp = RSAUtil.generateKeyPair();RSAPublicKey pubk = (RSAPublicKey) kp.getPublic();// 生成公钥RSAPrivateKey prik = (RSAPrivateKey) kp.getPrivate();// 生成私钥String publicKeyExponent = pubk.getPublicExponent().toString(16);// 16进制String publicKeyModulus = pubk.getModulus().toString(16);// 16进制request.getSession().setAttribute("prik", prik);result.put("pubexponent", publicKeyExponent);result.put("pubmodules", publicKeyModulus);return result;}@RequestMapping(value = "/loginCheck", method = RequestMethod.POST)@ResponseBodypublic Object login(String username, String password, HttpServletRequest request) throws Exception {JSONObject result = new JSONObject();byte[] en_result = new BigInteger(password, 16).toByteArray();byte[] de_result = RSAUtil.decrypt(RSAUtil.getKeyPair().getPrivate(), en_result);StringBuffer sb = new StringBuffer();sb.append(new String(de_result));String pwd = sb.reverse().toString();List<UserEntity> user = acountManageService.getUserByName(username);if (user != null && user.get(0).getPassword().equals(pwd.toString())) {request.getSession().setAttribute("user", user.get(0));result.put("result", "1");result.put("desc", "Login success");return result;}result.put("result", "0");result.put("desc", "Login failed");return result;}

4、前台请求公钥和加密：

$.ajax({            url:"userAction/userLogin",            dataType:"text",            type:"get",            success:function (data) {                var jn = $.parseJSON(data);                pubexponent = jn.pubexponent;                pubmodules = jn.pubmodules;            },            error:function () {                            }        })//////////////////////////    function cmdEncrypt($form) {        setMaxDigits(200);        var key = new RSAKeyPair(pubexponent, "", pubmodules);        var encrypedPwd = encryptedString(key, encodeURIComponent($form.find('input[type="password"]').val()));        $form.find('input[type="password"]').val(encrypedPwd);        return true;    }

5、RSAUtil类：

package com.bigdatalearning.utils;/** *  */import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.math.BigInteger;import java.security.KeyFactory;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.NoSuchAlgorithmException;import java.security.PrivateKey;import java.security.PublicKey;import java.security.SecureRandom;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.InvalidKeySpecException;import java.security.spec.RSAPrivateKeySpec;import java.security.spec.RSAPublicKeySpec;import javax.crypto.Cipher;/** * RSA 工具类。提供加密，解密，生成密钥对等方法。 * 需要到http://www.bouncycastle.org下载bcprov-jdk14-123.jar。 *  */public class RSAUtil {private static String RSAKeyStore = "D:/RSAKey.txt";/** * * 生成密钥对 * *  * @return KeyPair * * @throws EncryptException */public static KeyPair generateKeyPair() throws Exception {try {KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA",new org.bouncycastle.jce.provider.BouncyCastleProvider());final int KEY_SIZE = 1024;// 没什么好说的了，这个值关系到块加密的大小，可以更改，但是不要太大，否则效率会低keyPairGen.initialize(KEY_SIZE, new SecureRandom());KeyPair keyPair = keyPairGen.generateKeyPair();System.out.println(keyPair.getPrivate());System.out.println(keyPair.getPublic());saveKeyPair(keyPair);return keyPair;} catch (Exception e) {throw new Exception(e.getMessage());}}public static KeyPair getKeyPair() throws Exception {FileInputStream fis = new FileInputStream(RSAKeyStore);ObjectInputStream oos = new ObjectInputStream(fis);KeyPair kp = (KeyPair) oos.readObject();oos.close();fis.close();return kp;}public static void saveKeyPair(KeyPair kp) throws Exception {FileOutputStream fos = new FileOutputStream(RSAKeyStore);ObjectOutputStream oos = new ObjectOutputStream(fos);// 生成密钥oos.writeObject(kp);oos.close();fos.close();}/** * * 生成公钥 * *  * @param modulus * * @param publicExponent * * @return RSAPublicKey * * @throws Exception */public static RSAPublicKey generateRSAPublicKey(byte[] modulus,byte[] publicExponent) throws Exception {KeyFactory keyFac = null;try {keyFac = KeyFactory.getInstance("RSA",new org.bouncycastle.jce.provider.BouncyCastleProvider());} catch (NoSuchAlgorithmException ex) {throw new Exception(ex.getMessage());}RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger(modulus), new BigInteger(publicExponent));try {return (RSAPublicKey) keyFac.generatePublic(pubKeySpec);} catch (InvalidKeySpecException ex) {throw new Exception(ex.getMessage());}}/** * * 生成私钥 * *  * @param modulus * * @param privateExponent * * @return RSAPrivateKey * * @throws Exception */public static RSAPrivateKey generateRSAPrivateKey(byte[] modulus,byte[] privateExponent) throws Exception {KeyFactory keyFac = null;try {keyFac = KeyFactory.getInstance("RSA",new org.bouncycastle.jce.provider.BouncyCastleProvider());} catch (NoSuchAlgorithmException ex) {throw new Exception(ex.getMessage());}RSAPrivateKeySpec priKeySpec = new RSAPrivateKeySpec(new BigInteger(modulus), new BigInteger(privateExponent));try {return (RSAPrivateKey) keyFac.generatePrivate(priKeySpec);} catch (InvalidKeySpecException ex) {throw new Exception(ex.getMessage());}}/** * * 加密 * *  * @param key *            加密的密钥 * * @param data *            待加密的明文数据 * * @return 加密后的数据 * * @throws Exception */public static byte[] encrypt(PublicKey pk, byte[] data) throws Exception {try {Cipher cipher = Cipher.getInstance("RSA",new org.bouncycastle.jce.provider.BouncyCastleProvider());cipher.init(Cipher.ENCRYPT_MODE, pk);int blockSize = cipher.getBlockSize();// 获得加密块大小，如：加密前数据为128个byte，而key_size=1024// 加密块大小为127// byte,加密后为128个byte;因此共有2个加密块，第一个127// byte第二个为1个byteint outputSize = cipher.getOutputSize(data.length);// 获得加密块加密后块大小int leavedSize = data.length % blockSize;int blocksSize = leavedSize != 0 ? data.length / blockSize + 1: data.length / blockSize;byte[] raw = new byte[outputSize * blocksSize];int i = 0;while (data.length - i * blockSize > 0) {if (data.length - i * blockSize > blockSize)cipher.doFinal(data, i * blockSize, blockSize, raw, i* outputSize);elsecipher.doFinal(data, i * blockSize, data.length - i* blockSize, raw, i * outputSize);// 这里面doUpdate方法不可用，查看源代码后发现每次doUpdate后并没有什么实际动作除了把byte[]放到// ByteArrayOutputStream中，而最后doFinal的时候才将所有的byte[]进行加密，可是到了此时加密块大小很可能已经超出了// OutputSize所以只好用dofinal方法。i++;}return raw;} catch (Exception e) {throw new Exception(e.getMessage());}}/** * * 解密 * *  * @param key *            解密的密钥 * * @param raw *            已经加密的数据 * * @return 解密后的明文 * * @throws Exception */public static byte[] decrypt(PrivateKey pk, byte[] raw) throws Exception {try {Cipher cipher = Cipher.getInstance("RSA",new org.bouncycastle.jce.provider.BouncyCastleProvider());cipher.init(cipher.DECRYPT_MODE, pk);int blockSize = cipher.getBlockSize();ByteArrayOutputStream bout = new ByteArrayOutputStream(64);int j = 0;while (raw.length - j * blockSize > 0) {bout.write(cipher.doFinal(raw, j * blockSize, blockSize));j++;}return bout.toByteArray();} catch (Exception e) {throw new Exception(e.getMessage());}}}